hotdoglo
20-12-2010, 08:38 PM
Đoạn code sau mình set chân A0 là chân ADC, tín hiệu PWM chân C2 (CCP1). Khi dùng proteus thì mô phỏng ra tín hiệu. Nhưng khi dùng oscilloscope để kiểm tra thì ko có tín hiệu trên chân CCP1. Bạn nào giúp mình với
#include <16f877A.h>
#device *=16 ADC=10
#FUSES NOWDT, HS, NOPUT, NOPROTECT, NODEBUG, BROWNOUT, LVP, NOCPD, NOWRT
#use delay(clock=20000000)
#define use_portd_lcd TRUE
#use fast_io (b)
#include <lcd.c>
int dem;
float v_set,v_cur,v_truoc,v_truoc2; // v_cur: hien tai, v_truoc: lan doc truoc, v_truoc2: lan doc truoc nua
int16 u;
float x,count; //e: sai so hien tai, e_1: sai so truoc, e_2: sai so truoc nua, u:duty cycle
void main()
{
// delay_ms(5000); // delay tao khoi dong
delay_ms(100); // tao tre 100ms cho LCD khoi dong
lcd_init();
u=1000;
setup_adc_ports( AN0_AN1_AN3);
setup_adc(ADC_CLOCK_DIV_8);
SETUP_CCP1(CCP_PWM);
setup_timer_2(t2_div_by_16,0xff,1); // tan so pwm =19.2 Khz
///////////////////////// Tinh he so PID//////////////////////////
while (1)
{
set_adc_channel ( 0 );
delay_ms(500);
u= read_adc ();
set_PWM1_duty(u);
lcd_gotoxy (1,1);
printf(lcd_putc, " u=%lu",u);
delay_ms (100);
}
}
#include <16f877A.h>
#device *=16 ADC=10
#FUSES NOWDT, HS, NOPUT, NOPROTECT, NODEBUG, BROWNOUT, LVP, NOCPD, NOWRT
#use delay(clock=20000000)
#define use_portd_lcd TRUE
#use fast_io (b)
#include <lcd.c>
int dem;
float v_set,v_cur,v_truoc,v_truoc2; // v_cur: hien tai, v_truoc: lan doc truoc, v_truoc2: lan doc truoc nua
int16 u;
float x,count; //e: sai so hien tai, e_1: sai so truoc, e_2: sai so truoc nua, u:duty cycle
void main()
{
// delay_ms(5000); // delay tao khoi dong
delay_ms(100); // tao tre 100ms cho LCD khoi dong
lcd_init();
u=1000;
setup_adc_ports( AN0_AN1_AN3);
setup_adc(ADC_CLOCK_DIV_8);
SETUP_CCP1(CCP_PWM);
setup_timer_2(t2_div_by_16,0xff,1); // tan so pwm =19.2 Khz
///////////////////////// Tinh he so PID//////////////////////////
while (1)
{
set_adc_channel ( 0 );
delay_ms(500);
u= read_adc ();
set_PWM1_duty(u);
lcd_gotoxy (1,1);
printf(lcd_putc, " u=%lu",u);
delay_ms (100);
}
}